The Siemens 3SK11112AB30 is a SIRIUS safety relay basic unit from the Standard series, designed for safety-related control applications in industrial machinery, automation systems and machine-control panels. It provides 3 NO relay enabling contacts together with 1 NC relay signaling contact, allowing safety-related switching and status signaling within a suitable machine safety architecture.
The unit operates with a 24 V AC/DC supply and features spring-type push-in terminals, providing a convenient connection method for modern industrial control panels. Its compact relay-based design makes it suitable for OEM machinery, panel builders and system integrators requiring a practical safety relay solution.
The Siemens 3SK11112AB30 safety relay is designed to process appropriate safety-related input signals and control connected output circuits within a properly designed safety system.
Its three NO relay enabling contacts provide switching paths for external circuits, while the NC signaling contact can be used for suitable status or diagnostic signaling.
The device can be incorporated into safety-control architectures involving functions such as emergency-stop monitoring, protective-device monitoring and machine shutdown.
The actual safety function depends on the complete system design, including the connected safety devices, wiring, contactors and machine risk assessment.
The 3SK11112AB30 provides three normally open relay enabling contacts.
These contacts can be incorporated into appropriate external circuits as defined by the machine's safety architecture.
Depending on the application, the outputs may interface with suitable:
The exact function assigned to each output must be established from the complete safety design and applicable requirements.
Along with the three NO enabling contacts, the unit provides one normally closed relay signaling contact.
This contact can provide an additional switching path for status or diagnostic purposes.
Possible applications include:
The signaling contact should only be used for a safety-related function when the complete system has been appropriately designed and validated for that purpose.
A key feature of the Siemens 3SK11112AB30 is its 24 V AC/DC supply capability.
This allows the unit to be integrated into control systems using either 24 V AC or 24 V DC, subject to the specified operating requirements.
The flexibility can be useful in industrial control panels where different control-supply arrangements are encountered.
The supply and wiring should always follow the applicable Siemens installation requirements.
The 3SK11112AB30 uses spring-type terminals with push-in technology.
This provides a practical wiring solution for industrial control-panel applications and can help simplify installation and maintenance.
Push-in terminal technology can be particularly useful for panel builders working with standardized control-panel wiring.
Suitable conductors and installation procedures should be used according to the manufacturer's requirements.
The 3SK11112AB30 belongs to the Siemens SIRIUS 3SK safety relay Standard series.
The Standard series provides a dedicated solution for safety-related control applications where relay-based safety logic and output switching are required.
The device can be integrated with compatible safety inputs and external switching components to create an appropriate machine safety function.
Before selecting the unit, compatibility with the intended safety devices and complete control architecture should be verified.
The Siemens 3SK11112AB30 safety relay can be considered for appropriately designed applications including:
For OEM machine builders, the 3SK11112AB30 offers a compact relay-based solution for implementing suitable machine safety functions.
Its 3 NO enabling outputs provide multiple switching paths, while the 1 NC signaling contact can support status or diagnostic monitoring.
The ability to operate from 24 V AC/DC provides additional flexibility when integrating the device into different machine-control architectures.
The push-in spring terminals make the 3SK11112AB30 convenient for modern control-panel construction.
The device can be installed alongside compatible safety components, contactors, emergency-stop devices and other industrial control equipment.
Its compact relay output configuration can help panel builders create organized safety-control circuits while maintaining straightforward wiring.
The 3SK11112AB30 is a component of a complete safety-related control system and should not be treated as a standalone safety solution.
The final safety performance depends on the complete architecture, including:
The complete safety function should be appropriately designed, verified and validated before commissioning.
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The 3SK11112AB30 is a Siemens SIRIUS Standard series safety relay basic unit with 3 NO relay enabling contacts and 1 NC relay signaling contact.
It provides 3 NO relay enabling contacts.
Yes. It has 1 NC relay signaling contact.
The unit operates with a 24 V AC/DC supply.
It uses spring-type push-in terminals.
It belongs to the Siemens SIRIUS Standard safety relay series.
It can be incorporated into appropriately designed industrial machinery, machine safety systems, production lines, automation equipment and safety-control panels.
No. It is a safety relay basic unit and must be integrated into a properly designed and validated safety-related control system.
| Parameter | Specification |
|---|---|
| Product Series | Siemens SIRIUS 3SK1 |
| Model Number | 3SK1111-2AB30 |
| Variant | AB30 |
| Supply Voltage | 24V AC/DC |
| Output Contacts | 3 NO safety outputs + 1 NC signaling output |
| Mounting Type | DIN rail |
| Terminal Type | Screw terminals |
| Input Channels | 2-channel safety input |
| Safety Functions | E-stop, safety gate monitoring |
| Protection Class | IP20 |
| Operating Temperature | -25°C to +60°C |
| Switching Category | Safety relay (force-guided contacts) |
| Safety Level | SIL 3 / PL e (system dependent) |
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